Send trainer

[ppetru]

This could reuse a lot of the Read Trainer text generation, but focus on "head sending" skills instead.

This means helping the user send what's in their mind, instead of having them send something that's visible on the screen. Thus, the text to send would have to disappear after (or just before) the user has started sending.

For interfacing, this should use mouse and/or keyboard events configurable by the user. This would allow using any of the existing methods of hooking up a Morse key or paddle to the computer or mobile device.